Warning: Cannot modify header information

  • Resolved c

    (@igneous)


    7 years, 6 months ago

    I’m getting these errors on my Jetpack page on my sites. I have multiple sites on the same server and domain, and they’re all doing it. I tried to update the plugin, I tried to update wordpress, I deleted jetpack manually and uploaded manually, nothing changed the error. Any thoughts on how to fix this? Thanks
    Warning: Cannot modify header information – headers already sent by (output started at /home/asdf/public_html/wp-admin/includes/template.php:1995) in /home/igneous/public_html/wp-includes/rest-api.php on line 492

    Warning: Cannot modify header information – headers already sent by (output started at /home/asdf/public_html/asdf/wp-admin/includes/template.php:1995) in /home/asdf/public_html/asdf/wp-includes/rest-api.php on line 492

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  • Plugin Author Jeremy Herve

    (@jeherve)

    Jetpack Mechanic ??

    That’s a common issue I’m afraid, and something that’s most likely caused by another plugin on your site. You can follow the instructions below to find the source of the problem:

    1. Install and activate the Query Monitor plugin.
    2. Load the dashboard page and check that the error is still displayed.
    3. In Query Monitor, locate the wp-includes/rest-api.php call where the error appears.
    4. In the “Call Stack” section, check the different calls that are run. Below each call you should see the file making that call in grey.
    5. If one of the calls is made by another plugin or your theme, try deactivating that plugin or switching themes.
    6. If that solves the problem, you can send that call stack to the plugin or theme author to let them know.

    I hope this helps!

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